Story is Rachel Carson : environmental writer Which piece of evidence

explains the cause of Rachel Carson's
campaign against DDT?
Soon after, she began writing articles about the ocean, many of
which were adapted as radio broadcasts.
According to the friend, the pesticide had killed 10 songbirds in
her yard alone.
The companies producing them attacked Carson, claiming that the
pesticides were necessary.
O Eight years later, in 1972, the U. S. government banned the use of
DDT and other chemical pesticides.